For the method of godliness consists of these two things, pious doctrines, and virtuous practice: and neither are the doctrines acceptable to God apart from good works, nor does God accept the works which are not perfected with pious doctrines. For what profit is it, to know well the doctrines concerning God, and yet be a vile fornicator? And again, what profit is it, to be nobly temperate, and an impious blasphemer? A most precious possession therefore is the knowledge of doctrines...
St. Cyril of Jerusalem (Catechetical Lectures: Lecture 4 no. 2)

 

Links From Orthodox Sources

The Doctrine of the Orthodox Church: The Basic Doctrines - Orthodox Information Center

The Dogmatic Tradition of the Orthodox Church - The Greek Archdiocese of America 

I Believe; A Short Exposition on Orthodox Doctrine - Orthodox Christian Fellowship

Theology and Mysticism in the Tradition of the Eastern Church - by Vladimir Lossky

Rainbow Series on the Orthodox Faith Doctrine - by V. Rev Thomas Hopko, the Orthodox Church in America

The Orthodox Church -by Professor Constantine Scouteris, School of Theology of the University of Athens

Ways of Russian Theology - by Fr. George Florovsky

Excerpts from "Byzantine Theology," Historical trends and doctrinal themes - by John Meyendorff

THE DIDACHE, or Teaching of the Twelve Apostles, from St. Pachomius Library

The Orthodox Church By John Meyendorff  - Online Google Text.

An Online Orthodox Catechism adopted from ‘The Mystery of Faith’ by Bishop Hilarion Alfeyev

Recommended Further Reading